LinuxKPI: Add cancel_work() function.

Cancel a work not waiting for it to finish.

Sponsored by: Serenity Cyber Security, LLC
Reviewed by: manu, kib
MFC after: 1 week
Differential Revision: https://

LinuxKPI: Add cancel_work() function.

Cancel a work not waiting for it to finish.

Sponsored by: Serenity Cyber Security, LLC
Reviewed by: manu, kib
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D42811

(cherry picked from commit 1b2f43a7427ebf51561867f6c497833268014512)

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sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

LinuxKPI: Constantly use _LINUXKPI_ prefix in include guards

MFC after: 1 week
Reviewed by: bz, emaste, hselasky, manu
Differential Revision: https://reviews.freebsd.org/D33562

linuxkpi: Add rcu_work functions

The rcu_work function helps to queue some work after waiting for a grace
period.
This is needed by DRM drivers.

Sponsored-by: The FreeBSD Foundation
Reviewed by: hs

linuxkpi: Add rcu_work functions

The rcu_work function helps to queue some work after waiting for a grace
period.
This is needed by DRM drivers.

Sponsored-by: The FreeBSD Foundation
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D24942

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Linuxkpi: Prevent easy generated ctor name conflicts with prefix

Sponsored by: Dell EMC Isilon

Implement current_work() function in the LinuxKPI.

Tested by: Johannes Lundberg <[email protected]>
MFC after: 1 week
Sponsored by: Mellanox Technologies

Declare and set the global "system_highpri_wq" workqueue structure pointer
in the LinuxKPI.

Submitted by: Johannes Lundberg <[email protected]>
MFC after: 1 week
Sponsored by: Mellanox Technologies

Declare and set the global "system_highpri_wq" workqueue structure pointer
in the LinuxKPI.

Submitted by: Johannes Lundberg <[email protected]>
MFC after: 1 week
Sponsored by: Mellanox Technologies
Sponsored by: Limelight Networks

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Implement the INIT_DELAYED_WORK_ONSTACK() function macro in the LinuxKPI.

Submitted by: Johannes Lundberg <[email protected]>
MFC after: 1 week
Sponsored by: Mellanox Technologies
Sponsored by: Lim

Implement the INIT_DELAYED_WORK_ONSTACK() function macro in the LinuxKPI.

Submitted by: Johannes Lundberg <[email protected]>
MFC after: 1 week
Sponsored by: Mellanox Technologies
Sponsored by: Limelight Networks

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linuxkpi whitespace cleanup

Reviewed by: hselasky, markj
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D14807

Make sure the timer belonging to the delayed work in the LinuxKPI
gets drained before invoking the work function. Else the timer
mutex may still be in use which can lead to use-after-free situations,

Make sure the timer belonging to the delayed work in the LinuxKPI
gets drained before invoking the work function. Else the timer
mutex may still be in use which can lead to use-after-free situations,
because the work function might free the work structure before returning.

MFC after: 1 week
Sponsored by: Mellanox Technologies

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Fix implementation of the DECLARE_WORK() macro in the LinuxKPI to fully
initialize the declared work structure and not only the function callback
pointer.

MFC after: 1 week
Sponsored by: Mellanox

Fix implementation of the DECLARE_WORK() macro in the LinuxKPI to fully
initialize the declared work structure and not only the function callback
pointer.

MFC after: 1 week
Sponsored by: Mellanox Technologies

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LinuxKPI workqueue cleanup.

This change makes the workqueue implementation behave more like in
Linux, both functionality wise and structure wise.

All workqueue code has been moved to linux_work.c

LinuxKPI workqueue cleanup.

This change makes the workqueue implementation behave more like in
Linux, both functionality wise and structure wise.

All workqueue code has been moved to linux_work.c

Add an atomic based statemachine to the work_struct to ensure proper
operation. Prior to this change struct_work was directly mapped to a
FreeBSD task. When a taskqueue has multiple threads the same task may
end up being executed on more than one worker thread simultaneously.
This might cause problems with code coming from Linux, which expects
serial behaviour, similar to Linux tasklets.

Move all global workqueue function names into the linux_xxx domain to
avoid symbol name clashes in the future.

Implement a few more workqueue related functions and macros.

Create two multithreaded taskqueues for the LinuxKPI during module
load, one for time-consuming callbacks and one for non-time consuming
callbacks.

MFC after: 1 week
Sponsored by: Mellanox Technologies

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Implement drain_workqueue() function.

MFC after: 1 week
Sponsored by: Mellanox Technologies

In the zero delay case in queue_delayed_work() use the return value
from taskqueue_enqueue() instead of reading "ta_pending" unlocked and
also ensure the callout is stopped before proceeding.

MFC af

In the zero delay case in queue_delayed_work() use the return value
from taskqueue_enqueue() instead of reading "ta_pending" unlocked and
also ensure the callout is stopped before proceeding.

MFC after: 1 week
Sponsored by: Mellanox Technologies

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Minor workqueue cleanup:
- Make some functions global instead of inline to ease debugging.
- Fix some minor style issues.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Add more functions and types to the LinuxKPI.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Finish process of moving the LinuxKPI module into the default kernel build.

- Move all files related to the LinuxKPI into sys/compat/linuxkpi and
its subfolders.
- Update sys/conf/files and some M

Finish process of moving the LinuxKPI module into the default kernel build.

- Move all files related to the LinuxKPI into sys/compat/linuxkpi and
its subfolders.
- Update sys/conf/files and some Makefiles to use new file locations.
- Added description of COMPAT_LINUXKPI to sys/conf/NOTES which in turn
adds the LinuxKPI to all LINT builds.
- The LinuxKPI can be added to the kernel by setting the
COMPAT_LINUXKPI option. The OFED kernel option no longer builds the
LinuxKPI into the kernel. This was done to keep the build rules for
the LinuxKPI in sys/conf/files simple.
- Extend the LinuxKPI module to include support for USB by moving the
Linux USB compat from usb.ko to linuxkpi.ko.
- Bump the FreeBSD_version.
- A universe kernel build has been done.

Reviewed by: np @ (cxgb and cxgbe related changes only)
Sponsored by: Mellanox Technologies

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